PHOTOMESON EXPERIMENTS AT THE BERKELEY 340-MEV SYNCHROTRON

Technical Report · Fri Oct 31 04:00:00 EST 1958

OSTI ID:4307663

Mendes, V -P; Imhof, W; Kenney, R W; Knapp, E A; Perkins, W A

The recent experimental work on photomeson production from hydrogen and deuterium has concentrated on experiments designed to test the accuracy of the ChewLow theory. Two experimeats were performed: (a) measurement of tha differential cross section for photoproduction of positive pions by 260-Mev photons on hydrogen at angles from 0 to 160 deg , and b) the relative yield of positive pions from deuterium and hydrogen measured at angles from 20 to 60 deg and meson energies (lab system) ranging from 45 to 140 Mev. For these experiments a liquid hydrogen target wvith a condenser for liquefying deuterium was used. The positive pions were identified by their characteristic pi - mu decay. The main emphasis in these experiments was on small angle measurements. In this angalar region the measured differential cross section from hydrogen shows clearly the effect of the direct interaction of the incident photon with the meson current of the nucleon. An analysis of the angular distribution from 0 to 180 deg of these data and that from the Illinois and California Institutes of Technology experiments by the method suggested by Moravcsik shows that the magnitude of this effect is in good agreement with the theory. In the experiment on the relative yield from D and H, the Chew--Low theory predicts the magnitude of the spin-flip and no-spin-flip interactions. In this case, the magnitude of the effect is largest at small angles. The experimental points are in reasonably good agreement with the numerical results from the work of Uretsky, which is based on the Chew-Low theory and uses a plane-wave approximation corrected for the 'S neutron-neutron scattering in the final state. (auth)

• Research Organization: California Univ., Berkeley, CA (US). Radiation Lab.
• NSA Number: NSA-12-014936
• OSTI ID: 4307663
• Report Number(s): A/CONF.15/P/732
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANGULAR DISTRIBUTION-- BEAMS-- CHEW-LOW METHOD-- CONDENSERS-- DECAY-- DEUTERIUM-- ENERGY RANGE-- ERRORS-- HYDROGEN-- INTERACTIONS-- LIQUEFYING-- LIQUIDS-- MEASURED VALUES-- MESONS-- MUONS- - NEUTRONS-- NUMERICALS-- PIONS-- PRODUCTION-- SCATTERING-- SPIN-- SYNCHROTRONS-- TARGETS
ANGULAR DISTRIBUTION-- CONDENSERS-- CROSS SECTIONS-- CURRENTS-- DECAY-- DEUTERIUM-- ENERGY RANGE-- GAMMA RADIATION-- HYDROGEN-- INTERACTIONS-- LIQUEFYING-- LIQUIDS-- MEASURED VALUES-- MESONS-- MUONS-- NUCLEONS- - PHOTOPRODUCTION-- PIONS-- SYNCHROTRONS-- TARGETS
PHYSICS